Temporal analysis for user speed estimation in wireless networks

Patent metadata

Field	Value
Publication number	US-10901076-B2
Application number	US-201414904631-A
Country	US
Kind code	B2
Filing date	Jul 11, 2014
Priority date	Jul 12, 2013
Publication date	Jan 26, 2021
Grant date	Jan 26, 2021

Abstract

A method for estimating the speed of a user equipment connected to a base station of a wireless network, the method comprising the following steps: measuring the power of a signal transmitted between the user equipment and the base station; computing the derivative of the measured signal power with respect to time; computing the standard deviation of the computed derivative; estimating, from previously established reference data, the speed of the user equipment that corresponds to the computed standard deviation, the reference data associating a given user equipment speed with a certain computed standard deviation.

First claim

The invention claimed is:

1. A method for estimating a speed of a user equipment connected to a base station of a wireless network, the method comprising:
measuring a power of a signal transmitted between the user equipment and the base station;
computing a time derivative of the measured signal power, said time derivative representing a rate of change of the measured signal power with respect to time;
computing a standard deviation of the computed time derivative to achieve a result;
comparing the result to reference data established prior to said measuring, said reference data associating given user equipment speeds with given standard deviations; and
estimating, based on an outcome of said comparing, the speed of the user equipment.

2. The method of claim 1 , further comprising a normalization of the measured signal power.

3. The method of claim 1 , further comprising a filtering of the measured signal power.

4. The method of claim 1 , wherein the method is being carried out on a predefined number of measured signal powers.

5. The method of claim 4 , wherein the method is updated at each signal power measurement, in order to track the speed of the user equipment.

6. The method of claim 1 , wherein the reference data provides a one-to-one mapping of the given user equipment speeds to the given standard deviations for a given shadowing decorrelation distance, the shadowing decorrelation distance being relevant to the radio environment of the base station.

7. The method of claim 1 , wherein the signal power measurement is performed by the base station on an uplink signal transmitted from the user equipment.

8. The method of claim 1 , wherein the transmitted signal between the user equipment and the base station is a sounding reference signal.

9. A processor that estimates a speed of a user equipment connected to a base station of a wireless network, the processor being operative to:
measure a power of a signal transmitted between the user equipment and the base station;
compute a time derivative of the measured signal power, said time derivative representing a rate of change of the measured signal power with respect to time;
compute the standard deviation of the computed time derivative to achieve a result;
comparing the result to reference data established prior to said measuring, said reference data associating given user equipment speeds with given standard deviations; and
estimate, based on an outcome of said comparing, the speed of the user equipment.

10. The processor of claim 9 , further comprising a low pass filter for filtering the measured signal power.

11. A base station of a wireless network, said base station comprising a processor that estimates a speed of a user equipment connected to the base station, the processor being operative to:
measure a power of a signal transmitted between the user equipment and the base station;
compute a time derivative of the measured signal power, said time derivative representing a rate of change of the measured signal power with respect to time;
compute the standard deviation of the computed time derivative to achieve a result;
compare the result to reference data established prior to the signal power being measured, said reference data associating given user equipment speeds with given standard deviations; and
estimate, based on an outcome of said comparing, the speed of the user equipment.

12. A non-transitory computer readable medium including a computer program thereon, the computer program including code sections for performing instructions when executed on a processor, said instructions including instructions for:
measuring a power of a signal transmitted between a user equipment and a base station of a wireless network;
computing a time derivative of the measured signal power, said time derivative representing a rate of change of the measured signal power with respect to time;
computing a standard deviation of the computed time derivative to achieve a result;
comparing the result to reference data established prior to said measuring, said reference data associating given user equipment speeds with given standard deviations; and
estimating, based on an outcome of said comparing, the speed of the user equipment.

Assignees

• Alcatel Lucent
• Inst Nat Rech Inf Automat
• Alcatel Lucent Inria

Inventors

• Ben Rached Nidham
• Capdevielle Veronique
• Haddad Majed
• Ratovelomanana Frédéric
• Feki Afef
• Altman Eitan

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title

• G01S11/06 Primary

  using intensity measurements · CPC title

• H04W72/0413

  Electricity · mapped topic